GE Dishwasher Error Code 999: Water Inlet Valve Leak... | appliancefaults.com

Technical Background:

error code 999 on a GE dishwasher often indicates an issue with the water inlet system. The MCU (Main Control Unit) monitors the water level via the pressure sensor and controls the water inlet valve. If the MCU detects an unexpected water level or continuous filling, it can trigger error code 999. The water inlet valve is typically a 120V AC solenoid valve, and the pressure sensor sends a variable voltage signal back to the MCU.

Symptoms:

The homeowner reports the GE dishwasher is displaying error code 999 and may notice water continuing to fill even when the cycle is not running, or the dishwasher starts and stops intermittently.

Possible Causes:

Slow leak in the water inlet valve, causing continuous fill or pressure loss.
Faulty pressure sensor providing incorrect water level readings to the MCU.
Defective MCU (Main Control Unit) unable to properly interpret sensor data.
Wiring harness damage or loose connections affecting the water inlet valve or pressure sensor circuit.
Clogged or restricted drain line causing back pressure and affecting water level sensing.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the water inlet valve (typically at the bottom front or side of the dishwasher) and inspect for any signs of water leakage or corrosion.
3

Using a multimeter, check the resistance of the water inlet valve solenoid. A reading outside the manufacturer's specified range (typically around 1-2 kOhms) indicates a faulty valve.
4

Inspect the wiring harness and connectors leading to the water inlet valve and pressure sensor for any damage or loose connections. Repair or replace as needed.
5

Check the pressure sensor using a multimeter. It should have approximately 5V DC. Ensure its output signal varies as water level changes.
6

If the wiring and valve appear okay, consider replacing the MCU. This is often the last resort because of cost.
7

Restore power to the dishwasher and run a test cycle to verify the error code is cleared and the dishwasher is functioning correctly.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. High voltage is present within the dishwasher's components. Follow LOTO (Lockout/Tagout) procedures to ensure your safety.

Prevention:

Regularly inspect the water inlet valve and surrounding connections for any signs of leaks or corrosion. Use a high-quality dishwasher detergent to prevent clogs and ensure proper drainage. Check for debris around the float valve.

Expert Tip:

Some GE dishwashers have a diagnostic mode that can be accessed by pressing a specific sequence of buttons on the control panel (refer to the service manual). This can provide more detailed error information and help pinpoint the source of the problem. Try holding the start button down for five seconds, then pressing hi-temp scrub and heated dry followed by start again. The unit should enter service mode.

Frequently Asked Questions

•What is the typical lifespan of a GE dishwasher water inlet valve?

The typical lifespan is 5-7 years, depending on water quality and usage frequency.

•How do I test the pressure sensor on my GE dishwasher using a multimeter?

Disconnect the sensor and measure the voltage while adding water. The voltage should change linearly with water depth. Refer to the service manual for specific voltage ranges.

•Where can I find the service manual for my GE dishwasher model?

You can often find it online through appliance parts retailers or directly from GE's website. Search by model number.

GE Dishwasher Error Code 999: Water Inlet Valve Leak Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•What is the typical lifespan of a GE dishwasher water inlet valve?

•How do I test the pressure sensor on my GE dishwasher using a multimeter?

•Where can I find the service manual for my GE dishwasher model?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: